Extend gdb-jit support (OSX/locals+parameters/prettyprint)

Generate Mach-O in-memory objects for OSX. Dump locals and parameters
for non-optimized frames.

Unfortunately, it seems like more-recent-GDB on OSX there is a little
temperamental (eg, the version from macports will be missing symbols
from gdb-integration_g when the version included in xcode will not--
and this is with --gdbjit off).

Includes some Python scripts to make dealing with V8 values in gdb more
pleasant.

Patch by Luke Zarko.

Review URL: http://codereview.chromium.org/6995161

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8483 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

SConstruct

@@ -1155,8 +1155,8 @@ def VerifyOptions(env):
     return False
   if env['os'] == 'win32' and env['library'] == 'shared' and env['prof'] == 'on':
     Abort("Profiling on windows only supported for static library.")
-  if env['gdbjit'] == 'on' and (env['os'] != 'linux' or (env['arch'] != 'ia32' and env['arch'] != 'x64' and env['arch'] != 'arm')):
-    Abort("GDBJIT interface is supported only for Intel-compatible (ia32 or x64) Linux target.")
+  if env['gdbjit'] == 'on' and ((env['os'] != 'linux' and env['os'] != 'macos') or (env['arch'] != 'ia32' and env['arch'] != 'x64' and env['arch'] != 'arm')):
+    Abort("GDBJIT interface is supported only for Intel-compatible (ia32 or x64) Linux/OSX target.")
   if env['os'] == 'win32' and env['soname'] == 'on':
     Abort("Shared Object soname not applicable for Windows.")
   if env['soname'] == 'on' and env['library'] == 'static':

src/compiler.cc

@@ -411,7 +411,8 @@ static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) {
         String::cast(script->name())));
     GDBJIT(AddCode(Handle<String>(String::cast(script->name())),
                    script,
-                   info->code()));
+                   info->code(),
+                   info));
   } else {
     PROFILE(isolate, CodeCreateEvent(
         info->is_eval()
@@ -420,7 +421,7 @@ static Handle<SharedFunctionInfo> MakeFunctionInfo(CompilationInfo* info) {
         *info->code(),
         *result,
         isolate->heap()->empty_string()));
-    GDBJIT(AddCode(Handle<String>(), script, info->code()));
+    GDBJIT(AddCode(Handle<String>(), script, info->code(), info));
   }
 
   // Hint to the runtime system used when allocating space for initial
@@ -784,7 +785,8 @@ void Compiler::RecordFunctionCompilation(Logger::LogEventsAndTags tag,
 
   GDBJIT(AddCode(Handle<String>(shared->DebugName()),
                  Handle<Script>(info->script()),
-                 Handle<Code>(info->code())));
+                 Handle<Code>(info->code()),
+                 info));
 }
 
 } }  // namespace v8::internal

src/flag-definitions.h

@@ -371,6 +371,8 @@ DEFINE_bool(debug_script_collected_events, true,
 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)")
 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects")
 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk")
+DEFINE_string(gdbjit_dump_filter, "",
+              "dump only objects containing this substring")
 
 //
 // Debug only flags

src/gdb-jit.h

@@ -43,6 +43,8 @@
 namespace v8 {
 namespace internal {
 
+class CompilationInfo;
+
 #define CODE_TAGS_LIST(V)                       \
   V(LOAD_IC)                                    \
   V(KEYED_LOAD_IC)                              \
@@ -113,11 +115,13 @@ class GDBJITInterface: public AllStatic {
   static void AddCode(const char* name,
                       Code* code,
                       CodeTag tag,
-                      Script* script = NULL);
+                      Script* script,
+                      CompilationInfo* info);
 
   static void AddCode(Handle<String> name,
                       Handle<Script> script,
-                      Handle<Code> code);
+                      Handle<Code> code,
+                      CompilationInfo* info);
 
   static void AddCode(CodeTag tag, String* name, Code* code);
 

tools/gdb-v8-support.py

+# Copyright 2011 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+kSmiTag = 0
+kSmiTagSize = 1
+kSmiTagMask = (1 << kSmiTagSize) - 1
+
+
+kHeapObjectTag = 1
+kHeapObjectTagSize = 2
+kHeapObjectTagMask = (1 << kHeapObjectTagSize) - 1
+
+
+kFailureTag = 3
+kFailureTagSize = 2
+kFailureTagMask = (1 << kFailureTagSize) - 1
+
+
+kSmiShiftSize32 = 0
+kSmiValueSize32 = 31
+kSmiShiftBits32 = kSmiTagSize + kSmiShiftSize32
+
+
+kSmiShiftSize64 = 31
+kSmiValueSize64 = 32
+kSmiShiftBits64 = kSmiTagSize + kSmiShiftSize64
+
+
+kAllBits = 0xFFFFFFFF
+kTopBit32 = 0x80000000
+kTopBit64 = 0x8000000000000000
+
+
+t_u32 = gdb.lookup_type('unsigned int')
+t_u64 = gdb.lookup_type('unsigned long long')
+
+
+def has_smi_tag(v):
+  return v & kSmiTagMask == kSmiTag
+
+
+def has_failure_tag(v):
+  return v & kFailureTagMask == kFailureTag
+
+
+def has_heap_object_tag(v):
+  return v & kHeapObjectTagMask == kHeapObjectTag
+
+
+def raw_heap_object(v):
+  return v - kHeapObjectTag
+
+
+def smi_to_int_32(v):
+  v = v & kAllBits
+  if (v & kTopBit32) == kTopBit32:
+    return ((v & kAllBits) >> kSmiShiftBits32) - 2147483648
+  else:
+    return (v & kAllBits) >> kSmiShiftBits32
+
+
+def smi_to_int_64(v):
+  return (v >> kSmiShiftBits64)
+
+
+def decode_v8_value(v, bitness):
+  base_str = 'v8[%x]' % v
+  if has_smi_tag(v):
+    if bitness == 32:
+      return base_str + (" SMI(%d)" % smi_to_int_32(v))
+    else:
+      return base_str + (" SMI(%d)" % smi_to_int_64(v))
+  elif has_failure_tag(v):
+    return base_str + " (failure)"
+  elif has_heap_object_tag(v):
+    return base_str + (" H(0x%x)" % raw_heap_object(v))
+  else:
+    return base_str
+
+
+class V8ValuePrinter(object):
+  "Print a v8value."
+  def __init__(self, val):
+    self.val = val
+  def to_string(self):
+    if self.val.type.sizeof == 4:
+      v_u32 = self.val.cast(t_u32)
+      return decode_v8_value(int(v_u32), 32)
+    elif self.val.type.sizeof == 8:
+      v_u64 = self.val.cast(t_u64)
+      return decode_v8_value(int(v_u64), 64)
+    else:
+      return 'v8value?'
+  def display_hint(self):
+    return 'v8value'
+
+
+def v8_pretty_printers(val):
+  lookup_tag = val.type.tag
+  if lookup_tag == None:
+    return None
+  elif lookup_tag == 'v8value':
+    return V8ValuePrinter(val)
+  return None
+gdb.pretty_printers.append(v8_pretty_printers)
+
+
+def v8_to_int(v):
+  if v.type.sizeof == 4:
+    return int(v.cast(t_u32))
+  elif v.type.sizeof == 8:
+    return int(v.cast(t_u64))
+  else:
+    return '?'
+
+  
+def v8_get_value(vstring):
+  v = gdb.parse_and_eval(vstring)
+  return v8_to_int(v)
+
+
+class V8PrintObject (gdb.Command):
+  """Prints a v8 object."""
+  def __init__ (self):
+    super (V8PrintObject, self).__init__ ("v8print", gdb.COMMAND_DATA)
+  def invoke (self, arg, from_tty):
+    v = v8_get_value(arg)
+    gdb.execute('call __gdb_print_v8_object(%d)' % v)
+V8PrintObject()